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97059 MATERIAL SELECTION TESTING FOR THE ASGARD FIELD WELL TUBULARS

Picture for 97059 MATERIAL SELECTION TESTING FOR THE ASGARD
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Product Number: 51300-97059-SG
ISBN: 97059 1997 CP
Author: Perry Nice, Ardjan Kopliku, L. Scoppio
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A testing campaign has been performed to assess the applicabilityof the moditied 13% Cr martensitic stainless steels as tubing material for the production wells of Smorbukk and Smorbukk South Fields on the Asgard area of the North Sea. Due to the well conditions, mainly the high temperatures(up to 165°C), the high concentrations of chlorides (up to 68g/l) and the H2S partial pressure (1.8 kPa), sulphide stress cracking and Iocalked corrosion resistance were the main concerns.The design requirements for the specified minimum yield strength of the tubing material were 95 lM (655 MPa) and 110 kai (758 MPa). Eight steels from three different manufacturers with different chemicat compositions have been tested. To assess their SSC resistance eonstarrtload, four-point bent-beam and C-ring tests have been performed at room temperature. Furthermore, to assess the locatked corrosion resistance of the material pitting and crevice tests were performed at the highest temperature expected in service. The results of the tests have made possible to decide the applicable materials. Grade 95 ksi and 105 ksi steels showed very good resistance to SSC and only one of the 110 ksi grade materials tiled. The localized corrosion test results showed that the testing conditions were at the limit of the steel resistance. Keywords: sulphide stress cracking, crevice, pitting, modified 13%Cr, sour gas oil wells, tubing, testing
A testing campaign has been performed to assess the applicabilityof the moditied 13% Cr martensitic stainless steels as tubing material for the production wells of Smorbukk and Smorbukk South Fields on the Asgard area of the North Sea. Due to the well conditions, mainly the high temperatures(up to 165°C), the high concentrations of chlorides (up to 68g/l) and the H2S partial pressure (1.8 kPa), sulphide stress cracking and Iocalked corrosion resistance were the main concerns.The design requirements for the specified minimum yield strength of the tubing material were 95 lM (655 MPa) and 110 kai (758 MPa). Eight steels from three different manufacturers with different chemicat compositions have been tested. To assess their SSC resistance eonstarrtload, four-point bent-beam and C-ring tests have been performed at room temperature. Furthermore, to assess the locatked corrosion resistance of the material pitting and crevice tests were performed at the highest temperature expected in service. The results of the tests have made possible to decide the applicable materials. Grade 95 ksi and 105 ksi steels showed very good resistance to SSC and only one of the 110 ksi grade materials tiled. The localized corrosion test results showed that the testing conditions were at the limit of the steel resistance. Keywords: sulphide stress cracking, crevice, pitting, modified 13%Cr, sour gas oil wells, tubing, testing
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